Avoid expensive status update in LuceneOperator

Author: dnhatn

x-pack/plugin/esql/compute/src/main/java/org/elasticsearch/compute/lucene/LuceneOperator.java

@@ -33,7 +33,6 @@
 
 import java.io.IOException;
 import java.io.UncheckedIOException;
-import java.util.Collection;
 import java.util.Collections;
 import java.util.HashSet;
 import java.util.List;
@@ -284,20 +283,14 @@ List<Object> tags() {
     public String toString() {
         StringBuilder sb = new StringBuilder();
         sb.append(this.getClass().getSimpleName()).append("[");
-        sb.append("shards = ").append(sortedUnion(processedShards, sliceQueue.remainingShardsIdentifiers()));
+        sb.append("shards = ")
+            .append(sliceQueue.partitioningStrategies().keySet().stream().sorted().collect(Collectors.joining(",", "[", "]")));
         sb.append(", maxPageSize = ").append(maxPageSize);
         describe(sb);
         sb.append("]");
         return sb.toString();
     }
 
-    private static Set<String> sortedUnion(Collection<String> a, Collection<String> b) {
-        var result = new TreeSet<String>();
-        result.addAll(a);
-        result.addAll(b);
-        return result;
-    }
-
     protected abstract void describe(StringBuilder sb);
 
     @Override

x-pack/plugin/esql/compute/src/main/java/org/elasticsearch/compute/lucene/LuceneSliceQueue.java

@@ -23,7 +23,6 @@
 import java.io.UncheckedIOException;
 import java.util.ArrayList;
 import java.util.Arrays;
-import java.util.Collection;
 import java.util.Collections;
 import java.util.Comparator;
 import java.util.HashMap;
@@ -178,17 +177,6 @@ public Map<String, PartitioningStrategy> partitioningStrategies() {
         return partitioningStrategies;
     }
 
-    public Collection<String> remainingShardsIdentifiers() {
-        List<String> remaining = new ArrayList<>(slices.length());
-        for (int i = 0; i < slices.length(); i++) {
-            LuceneSlice slice = slices.get(i);
-            if (slice != null) {
-                remaining.add(slice.shardContext().shardIdentifier());
-            }
-        }
-        return remaining;
-    }
-
     public static LuceneSliceQueue create(
         List<? extends ShardContext> contexts,
         Function<ShardContext, List<QueryAndTags>> queryFunction,